Denso 3165 Spark Plug

Overview of the Denso 3165 Spark Plug

The Denso 3165 spark plug is engineered for reliable ignition performance in select Audi, Honda, Hyundai, and Volkswagen models. Featuring a U-groove ground electrode tip design, this spark plug supports efficient combustion and consistent engine operation.

• U-groove ground electrode tip for improved spark exposure
• Nickel ground electrode core and tip for durability
• Copper center electrode core with nickel tip for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 14mm thread diameter and 19mm reach
• Pre-gap size of 0.8 mm for precise ignition timing
• Manufacturer heat range of 22 suitable for various driving conditions
• Hex size of 16 mm for standard installation tools

Detailed Product Description

The Denso 3165 spark plug belongs to the U-Groove Conventional product line, which is designed to enhance ignition efficiency through its unique U-groove ground electrode tip. This design increases the spark exposure area, promoting better flame kernel development and combustion stability. The spark plug’s nickel ground electrode core and tip provide resistance to wear and corrosion, while the copper center electrode core ensures excellent thermal conductivity and consistent spark delivery. With a pre-gap size of 0.8 mm and a flat seat type, the Denso 3165 maintains precise ignition timing and secure seating in the cylinder head.

Compatible with a range of Audi models including the A3, A4, A5, A6, TT, and their Quattro variants, as well as Volkswagen models such as the Golf, Jetta, Passat, and Tiguan, this spark plug also fits Honda Civic and Hyundai Scoupe vehicles. The part number 3165 identifies this specific configuration, ensuring proper fitment and performance.

Applications and Common Issues Addressed

• Restores consistent ignition in Audi A4 and Volkswagen Golf engines
• Reduces misfires and rough idling in Honda Civic and Hyundai Scoupe
• Improves fuel efficiency and engine responsiveness in Volkswagen Passat and Audi Q5
• Helps maintain stable combustion in turbocharged engines like Audi S models
• Addresses spark plug fouling and electrode wear in high-mileage vehicles

Installation Notes and Tips

• Ensure the spark plug gap is set to 0.8 mm before installation
• Use a 16 mm socket wrench for proper tightening torque
• Verify flat seat compatibility with the cylinder head to prevent leaks
• Apply anti-seize compound sparingly on threads if recommended by the vehicle manufacturer
• Replace spark plugs in sets to maintain balanced engine performance

Quality Assurance and Warranty

Denso spark plugs, including the 3165 model, are manufactured to meet strict quality standards for durability and performance. The use of nickel and copper materials in electrode construction ensures resistance to wear and thermal stress. While specific warranty details may vary, Denso products typically come with manufacturer-backed coverage against defects in materials and workmanship.